two sets of numbers we're watching closely tonight, the latest gallup poll showing governor romney holding a slim lead, 49-47 nationally, but both campaigns are looking at these numbers from ohio, the battleground state that might decide this. the president with a narrow advantage. tuesday's debate between mitt romney and the president more crucial, and the president's team acknowledging tonight there will be changes in his debate strategy. david kerley at the white house tonight. >> hello, everybody, hello. i brought some food. >> reporter: president obama took a break today to visit a campaign office, now into his second day of intense debate preparation. >> how is it going, sir? >> it is going great. >> reporter: the president is holed up at this williamsburg, virginia, resort walking and enjoying the scenery, we are told, between sessions far from the campaign trail, preparing for his rematch with romney. >> i don't think in recorder -- in the history of presidential debates has there been such a momentum shift off of the first presidential debate, and so the president has to turn the